Find whether a file problem comes from the app, extension, download corruption or permissions without risking the only copy.

Try these checks in order

Save work if possible. Complete one check at a time and retest the original symptom. Stop when the issue is resolved.

01Check file type and app

Confirm the expected extension and use a trusted compatible application. Do not rename extensions to guess the format.

02Verify the source

If downloaded, check the source and try a fresh copy when appropriate. Test another file of the same type to separate the app from one damaged file.

03Protect an original copy

Keep an untouched copy before repair and use software from the file-format publisher or another trusted source.

How to read the result

If other files open, the specific file or download is more suspect; if all similar files fail, check the default app or compatibility.

Protect the original file before trying to repair it

If only one file fails, test a copy and verify the extension and source before installing software. If every file of the same type fails, check the intended application and its version. An unsupported-format message differs from a file that is zero bytes or reports corruption; do not upload confidential files to unknown online converters.

Before changing more settings: Record the file type/extension, exact error, source of the file, approximate size, application used, and whether a separate copy opens.

Important safety note

Do not upload confidential files to unknown online converters or overwrite the only copy of a damaged file.

Model-specific reference note

Windows menus and recovery options vary by version and device. Use the exact Windows version, device model and error message when checking your next step. This guide keeps the diagnostic steps together so you can continue troubleshooting without leaving SafeCode.

Related troubleshooting

Need help narrowing it down?

Still stuck? Get help choosing the next step

Have the model, Windows version, exact error and steps tried available. Never share passwords or recovery keys.

☎ Call Computer Support ↗

General information only. Menus and recovery options vary by version and device.